问题
单项选择题
氰化物可
A．抑制δ-氨基-γ-酮戊酸脱水酶和血红素合成酶
B．抑制某些含铁的酶
C．抑制某些含铜的酶
D．抑制含巯基的酶
E．抑制细胞色素氧化酶
答案
参考答案：E
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氰化物可
A．抑制δ-氨基-γ-酮戊酸脱水酶和血红素合成酶
B．抑制某些含铁的酶
C．抑制某些含铜的酶
D．抑制含巯基的酶
E．抑制细胞色素氧化酶
参考答案：E
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| When I was thirteen years old, a boy gave me an important gift. It was a smile. It was the early autumn of my first year at a junior high school, and my old school was far away. As a result, no one knew who I was. I was very lonely and afraid to make friends with anyone. Every time I heard the other students talking and laughing, I felt my heart break. I couldn't talk to anyone about my problem, and I didn't want my parents to worry about me. Then one day, my classmates talked happily with their friends, but I sat at my desk unhappily as usual. At that moment, a boy entered the classroom. I didn't know who he was. He passed me and then turned back. He looked at me and smiled without a word. Suddenly, I felt the touch of something bright and friendly. It made me feel happy and warm. That smile changed my life. I started to talk with the other students and made friends. Day by Day, I became closer to everyone in my class. The boy with the lucky smile has become my best friend now. One day, I asked him why he smiled, but he couldn't remember smiling at me! It doesn't matter because all the dark days have gone. Now I believe that the world is what you think it is. If you think you are lonely, you might always be alone. So smile at the world and it will smile back.
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